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From Benjamin Reed <br...@yahoo-inc.com>
Subject RE: A question about "Connection timed out" and "operation timeout"
Date Thu, 20 Aug 2009 13:52:09 GMT
are you using the single threaded or multithreaded C library? the exceeded deadline message
means that our thread was supposed to get control after a certain period, but we got control
that many milliseconds late. what is your session timeout?


From: Qian Ye [yeqian.zju@gmail.com]
Sent: Thursday, August 20, 2009 3:17 AM
To: zookeeper-user
Subject: A question about "Connection timed out" and "operation timeout"

Hi guys:

I met the problem again: an ephemeral node disappeared, and I found it
because my application got a "operation timeout"

My application which created an ephemeral node at the zookeeper server,
printed the following log

*WARNING: 08-20 03:09:20:  auto * 182894118176
[logid:][reqip:][auto_exchanger_zk_basic.cpp:605]get children
fail.[/forum/elect_nodes][-7][operation timeout]*

and the Zookeeper client printed the following log (the log level is INFO)

2009-08-19 21:36:18,067:3813(0x9556c520):ZOO_INFO@log_env@545: Client
environment:zookeeper.version=zookeeper C client 3.2.0
    606 2009-08-19 21:36:18,067:3813(0x9556c520):ZOO_INFO@log_env@549:
Client environment:host.name=jx-ziyuan-test00.jx.baidu.com
    607 2009-08-19 21:36:18,068:3813(0x9556c520):ZOO_INFO@log_env@557:
Client environments.name=Linux
    608 2009-08-19 21:36:18,068:3813(0x9556c520):ZOO_INFO@log_env@558:
Client environments.arch=2.6.9-52bs
    609 2009-08-19 21:36:18,068:3813(0x9556c520):ZOO_INFO@log_env@559:
Client environments.version=#2 SMP Fri Jan 26 13:34:38 CST 2007
    610 2009-08-19 21:36:18,068:3813(0x9556c520):ZOO_INFO@log_env@567:
Client environment:user.name=club
    611 2009-08-19 21:36:18,068:3813(0x9556c520):ZOO_INFO@log_env@577:
Client environment:user.home=/home/club
    612 2009-08-19 21:36:18,068:3813(0x9556c520):ZOO_INFO@log_env@589:
Client environment:user.dir=/home/club/user/luhongbo/auto-exchanger
    613 2009-08-19 21:36:18,068:3813(0x9556c520):ZOO_INFO@zookeeper_init@613:
Initiating client connection,
host=, wa
tcher=0x408c56 sessionId=0x0
sessionPasswd=<null> context=(nil) flags=0
    614 2009-08-19 21:36:18,069:3813(0x41401960):ZOO_INFO@check_events@1439:
initiated connection to server []
    615 2009-08-19 21:36:18,070:3813(0x41401960):ZOO_INFO@check_events@1484:
connected to server [] with session id=1232c1688a20093
    616 2009-08-20
Exceeded deadline by 520ms
    617 2009-08-20
Exceeded deadline by 14ms
    618 2009-08-20
Exceeded deadline by 48ms
    619 2009-08-20
Exceeded deadline by 24ms
    620 *2009-08-20
03:09:20,289:3813(0x41401960):ZOO_WARN@zookeeper_interest@1335: Exceeded
deadline by 264ms*
    621 *2009-08-20
03:09:20,295:3813(0x41401960):ZOO_ERROR@handle_socket_error_msg@1388: Socket
[] zk retcode=-7, errno=110(Connection timed out): conn
ection timed out (exceeded timeout by 264ms)*
    622 *2009-08-20
03:09:20,309:3813(0x41401960):ZOO_WARN@zookeeper_interest@1335: Exceeded
deadline by 284ms*
    623 *2009-08-20
03:09:20,309:3813(0x41401960):ZOO_ERROR@handle_socket_error_msg@1433: Socket
[] zk retcode=-4, errno=111(Connection refused):
server         refused to accept the client*
    624 *2009-08-20 03:09:20,353:3813(0x41401960):ZOO_INFO@check_events@1439:
initiated connection to server []*
    625 *2009-08-20 03:09:20,552:3813(0x41401960):ZOO_INFO@check_events@1484:
connected to server [] with session id=1232c1688a20093*

I don't know why the "connection timed out" happened at *2009-08-20
03:09:20,295:3813, *and the server refuse to accept the client. Could some
one give me any hints? And I'm not sure the meaning of "Exceeded deadline by
xxms", need some help too.

P.S. I used the Zookeeper 3.2.0 (Server and C Client API) and run a
stand-alone instance

Thx all~

With Regards!

Ye, Qian
Made in Zhejiang University

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